plugins: Add "gcloud" plugin (#386)

Co-authored-by: Koichi Murase <myoga.murase@gmail.com>

plugins/gcloud/README.md

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+# gcloud
+
+This plugin provides completion support for the
+[Google Cloud SDK CLI](https://cloud.google.com/sdk/gcloud/).
+Based on [gcloud plugin for oh-my-zsh](https://github.com/ohmyzsh/ohmyzsh/tree/master/plugins/gcloud).
+
+To use it, add `gcloud` to the plugins array in your bashrc file.
+
+```bash
+plugins=(... gcloud)
+```
+
+It relies on you having installed the SDK using one of the supported options
+listed [here](https://cloud.google.com/sdk/install).
+
+## Plugin Options
+
+* Set `OMB_PLUGIN_GCLOUD_HOME` in your `bashrc` file before you load oh-my-bash if you have
+your GCloud SDK installed in a non-standard location. The plugin will use this
+as the base for your SDK if it finds it set already.
+
+* If you do not have a `python2` in your `PATH` you'll also need to set the
+`CLOUDSDK_PYTHON` environment variable at the end of your `.bashrc`. This is
+used by the SDK to call a compatible interpreter when you run one of the
+SDK commands.

plugins/gcloud/gcloud.plugin.sh

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+#!/bin/bash oh-my-bash.module
+# gcloud.plugin.sh
+# Author: Ian Chesal (github.com/ianchesal) -- ohmyzsh/gloud.plugin.zsh
+# Author: Antonino Cangialosi (github.com/ninoCan)
+# Fork of oh-my-zsh gcloud plugin
+
+function _omb_plugin_gcloud_set_home_var() {
+  if [[ ! ${OMB_PLUGIN_GCLOUD_HOME-} ]]; then
+    local -a search_locations=(
+      "$HOME/google-cloud-sdk"
+      "/usr/local/Caskroom/google-cloud-sdk/latest/google-cloud-sdk"
+      "/opt/homebrew/Caskroom/google-cloud-sdk/latest/google-cloud-sdk"
+      "/usr/share/google-cloud-sdk"
+      "/snap/google-cloud-sdk/current"
+      "/usr/lib/google-cloud-sdk"
+      "/usr/lib64/google-cloud-sdk"
+      "/opt/google-cloud-sdk"
+      "/opt/local/libexec/google-cloud-sdk"
+    )
+
+    local gcloud_sdk_location
+    for gcloud_sdk_location in "${search_locations[@]}"; do
+      if [[ -d $gcloud_sdk_location ]]; then
+        OMB_PLUGIN_GCLOUD_HOME=$gcloud_sdk_location
+        break
+      fi
+    done
+  fi
+}
+
+function _omb_plugin_gcloud_set_completions() {
+  if [[ ${OMB_PLUGIN_GCLOUD_HOME-} ]]; then
+    # Only source this if gcloud isn't already on the path
+    if _omb_util_binary_exists gcloud; then
+      if [[ -f $OMB_PLUGIN_GCLOUD_HOME/path.bash.inc ]]; then
+        source "$OMB_PLUGIN_GCLOUD_HOME/path.bash.inc"
+      fi
+
+      # Look for completion file in different paths
+      local -a completion_filepath_candidates=(
+        "${OMB_PLUGIN_GCLOUD_HOME}/completion.bash.inc"    # default location
+        "/usr/share/google-cloud-sdk/completion.bash.inc"  # apt-based location
+      )
+      local comp_file
+      for comp_file in "${completion_filepath_candidates[@]}"; do
+        if [[ -f $comp_file ]]; then
+          source "$comp_file"
+          break
+        fi
+      done
+    fi
+  fi
+}
+
+_omb_plugin_gcloud_set_home_var
+_omb_plugin_gcloud_set_completions